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Restore a deleted public folder in Exchange Online

  • Artikkeli

This article walks you through the steps to restore a deleted public folder in Exchange Online.

Public folders that have been deleted by users (using clients like Outlook) or admins (using administrative tools like PowerShell or the Exchange admin center) are normally stored in the public folder dumpster located in \NON_IPM_SUBTREE\DUMPSTER_ROOT. Deleted folders are preserved there until the retention period ends.

For the scenarios where public folder contents are put on hold using retention policies, the folders that are removed from \NON_IPM_SUBTREE\DUMPSTER_ROOT are preserved under \NON_IPM_SUBTREE\DiscoveryHolds until the retention hold period ends.

You can restore folders that are preserved in the public folder dumpster or under the DiscoveryHolds folder using Exchange Online PowerShell. Restoring the public folder will restore all subfolders and items present in the folder.

In rare scenarios, you might also find folders under \NON_IPM_SUBTREE\LOST_AND_FOUND. See this blog post for details on LOST_AND_FOUND and how to recover folders if you find them there.

Note

The folders in the dumpster are permanently deleted after the retention period ends. After a public folder has been permanently deleted, you can't restore it, unless the folder is preserved under DiscoveryHolds by a retention policy.

Permissions required

The user restoring the public folder must have the Public Folders role assigned to them. By default, this role is assigned to users present in the Organization Management role group.

Restore a deleted public folder

  1. Connect to Exchange Online PowerShell.

  2. Determine if the public folder you want to restore is in the public folder dumpster.

    The following command lists all non-system public folders in the dumpster:

    Get-PublicFolder \NON_IPM_SUBTREE\DUMPSTER_ROOT -Recurse -ResultSize Unlimited | where {$_.FolderClass -ne "$null"}

    Alternatively, you can search for specific folders. For example, the following command searches for a deleted public folder named Marketing:

    Get-PublicFolder \NON_IPM_SUBTREE\DUMPSTER_ROOT -Recurse -ResultSize Unlimited | where {$_.Name -like "Marketing"}

    Public folders under \NON_IPM_SUBTREE\DiscoveryHolds have a GUID appended to their name that you'll need to account for in your search.

    For example, the following command searches for a deleted public folder named Sales:

    Get-PublicFolder \NON_IPM_SUBTREE\DiscoveryHolds -Recurse -ResultSize Unlimited | where {$_.Name -like "*Sales*"}

  3. Use the following syntax to restore a public folder:

    Set-PublicFolder -Identity "Full path of folder to be restored" -Path "Parent folder path where folder needs to be restored"

    For example, run the following command to restore a public folder named PF1 to the root of the public folder tree:

    Set-PublicFolder -Identity \NON_IPM_SUBTREE\DUMPSTER_ROOT\DUMPSTER_EXTEND\RESERVED_1\RESERVED_1\9f32c468-4bc2-42aa-b979-16a057394b2f\PF1 -Path \

    The following alternate example restores a public folder named Sales to the root of the public folder tree:

    Set-PublicFolder -Identity \NON_IPM_SUBTREE\DiscoveryHolds\Sales_774d775c-da53-4ee7-869c-353c8a6e3265 -Path \

    If you don't know the original path of the deleted folder, you can find the folder's original path before it was deleted.

    For example, the following commands reveal the original path of the deleted folder named Marketing:

    $folder = Get-PublicFolder \NON_IPM_SUBTREE\DUMPSTER_ROOT -Recurse -ResultSize Unlimited | where {$_.Name -like "Marketing"}; Get-PublicFolder (Get-PublicFolder $folder.ParentPath).DumpsterEntryId

Note

Do not specify \IPM_Subtree in the path when restoring the public folder. For example:

Correct syntax:

Set-PublicFolder \non_ipm_subtree\discoveryholds\Black_73e0bd95-7972-4599-a25b-cdf46345b62b -Path \Finance\

In-correct syntax:

Set-PublicFolder \non_ipm_subtree\discoveryholds\Black_73e0bd95-7972-4599-a25b-cdf46345b62b -Path \IPM_Subtree\Finance\

Restore a specific subfolder

Restoring a folder restores all of its subfolders, but you can also restore only one subfolder.

For example, the following commands restore Subfolder1 under \Parent1:

$pf = Get-PublicFolder \NON_IPM_SUBTREE\DUMPSTER_ROOT -Recurse | where {$_.Name -eq "Subfolder1"}; Set-PublicFolder $pf.identity -Path \Parent1

Restore a public calendar folder

You can restore a public calendar folder using the same procedure as any other public folder, but there are special considerations.

When deleting a public calendar folder, a user sees the following options:

Delete calendar dialog box.

If the user selected "Yes", the items were deleted. In this case, you can restore the public folder, but the items cannot be recovered.

Note

We don't recommend using Outlook to restore deleted public folders because Outlook truncates the public folder names. This issue is under investigation and this article will be updated when a fix is available.